Electric heater



Hf. 9 8, 5 4 l TI. 0 0 rr T H G U Nh Feb. 2Q, 1923.

ELECTRIC HEATER.

FILED MAR. 8. 1920.

INVENTO'R ATTORNEY Patented Feb. 20, 1923.

UNITED lSTATES EDWIN N. LIGHTFOOT, OF NEW YORK, N. Y. C0., OF MILWAUKEE.WISCONSIN,

ELECTRIC Application led March 8,

To all 'whom it may concern:

Be it known that I, EDWIN N. LIGH'rroo'r,

a citizen of the United States, residing at New York, in the county ofBronx and 6 State of New York, have invented new and useful Improvementsin Electric Heaters, of

which the following is a specification.

This invention rela-tes to electric heaters. More particularly itrelates to flat electric heaters in which the resistor is enclosed byand insulated from a sheet metal armor. One of the objects of thisinvention is to provide a simple, compact and durable terminal of aminimum number ofparts for use in heaters of this type. y

Another object is to provide a terminal which may be assembled with theother elements of the heater in such manner that the entire assembledheater may be compressed in the usual manner without taking specialprecautions to protect the terminal.

Another object is to provide a terminall which in being attached to theheater requires a minimum number of operations.

Another object is tov provide a terminal to which the resistor may bedirectly connected.

Another object is to vprovide an improved heater the parts of which maybe easily and 30 quickly assembled.

Another object is to provide an improved heater wherein during theassembly thereof the possibility of disarrangement of parts is reducedto a minimum. I

Another object is to provide an improved heater wherein the terminal andits support are insulated from the heater casing.

Another object is to provide a terminal y which when mounted ontheheater, permits the heater to be mounted upon a support with the heatereither parallel with or at an angle thereto.

Another object is to provide a terminal Which may form part or all ofone of the reenforcing plates of a flat heater.

Other objects and advantages of this invention will appear from thefollowing specification.

Several embodiments of this invention are illustrated in theaccompanying drawings,

in which Fig. 1 is a perspective of a fiat heater equipped with aterminal.

PATENT OFFICE.

, ASSIGNOR T0 THE CUTLER-HAMMER MFG.

A CORPORATION OF WISCONSIN.

HEATER. i

1920. serial No. 364,128.

Fig. 2 is a vertical section of the heater on line 2 2 of Fig. 1.

Fig. 3 is a plan of the heater with portions broken away to show theresistor connected with the terminal.

Fig. 4 is an end elevation of the heater.

Fig. 5 is a plan of a terminal blank.

Fig. 6 is a vertical section through an eX- panded terminal.

Fig. 7 is a top plan of a modified form of t-he terminal wherein the twoterminals of the heater form the upper reenforcing plate thereof.

Fig. 8 is a vertical section on line 8 8 of F ig. 7. A

Referring to Figs. 1 to 4 of the drawings, the heater here showncomprises a sheet metri plate 10 having anges folded over a sheet metalplate 14 to form an enclosure for a suitable resistor 12 wound about acore 13 of insulation. The resistor 12 is insulated from the plates 10and 14 by means yof insulating strips 11 and 15.

The heater is provided with terminals 2O positioned at each end thereof.The terminal 20 comprises a flatbase 21 and a perforated extension 22.The terminal is punched from sheet metal of a thickness preferably notgreater than the thickness of the plate 14.

lVhen assembling the heater with its terminals. the ends of the resistorare extended through openings 24 in insulating strips 23. One insulatingstrip 23'is then placed at each end of the heater. with an edge thereofoverlapping the end of the insulating strip 15. The blank terminals arethen placed on top of the insulating strips 23 With the extensions 22extending beyond the ends of the heater. Each insulating strip 23 is ofsufficient length to permit the ends thereof to be folded over toinsulate the' base'21 from the folded over flanges of the plate 10.lVhen thus assembled extension 22 of each terminal is in the same` planeas the base 21 thereof. so that the entire structure may be compressedto definitely position the elements thereof in their proper relation,and to produce a thin heater. During `this compressing Operation. nospecial precautions need be taken to protect the terminals since theyare flat and do not project beyond the surface of the reenforcingplates.

, bent to lie in a pla-ne perpendicular to the plate; in fact, withvthisform of terminal, the perforated extension may be positioned at anydesired angle to the heater.

ligs. and 8 show a modified form of the heater in which the base 21 ofthe terminal is made of suficient length to form the upper reenforcingplate taking the place of the plate 14. shown in lFigs. 1 to 4. Theinsulating strip separating the base of these two terminals from theresistor is also of suicient width to fold over and insulate the base ofthe terminals from the flanges of the lower reenforcing plate 10. rllhebases of the two terminals are insulated from each other by being spacedapart.

llt is to be understood that the drawings and the description thereofare to be interpreted in an illustrative sense and not a limiting sensefor its is obvious that the invention may be embodied in otherstructures than those illustrated.

What is claimed is,

1. A heater having in combination a resistor` an armor enclosing theresistor. insulating strips separating the resistor'and the armor, aterminal of single ply material having a base insulated from and rigidlyheld by the armor and an extension extending from the base, and meansfor connecting the resistor to the extension of the terminal.

2. A heater having in combination an insulating strip, a resistorthereon, an armor enclosing the resistor and insulating strip throughouttheir length, insulating strips separating the resistor and the armor,and a terminal having a base rigidly held by integral portions of thearmor but insulated therefrom, the terminal also having means forclamping the resistor thereto. Y

3. A heater having in combination a resistor, an armor enclosing theresistor. insulating strips separating the resistor and the armor, aterminal having a base insulated from and rigidly held by the armor, aperfora'ted extension carried by the base, and a clamping memberextending through' the perforation to engage and clamp the resistor tothe extension.

4. A heater having in combination a resistor, an armor enclosing theresistor, insulating strips separatingthe resistor and the armor, aterminal having a base insulated from and supported by the armor, aperforated extension extending from the base, and a rivet extendingthrough the perforation to engage and clamp the resistor to theextension.

5. A heater having in combination a resistor, an armor enclosing theresistor, and insulating strips separating the resistor and the armor, aterminal having a base insulated from and firmly held by the armor, aperforated extension extending from the base, and a hollow rivetextending through the perforation to clamp the resistor to the terminaland serving as a point of connection for an electric conductor.

6. A terminal for electrical apparatus comprising a Hat base forsecuringthe terminal to the electrical apparatus, an extension carried by thebase, and having a peerforation therein, and connecting means forconnecting an electric conductor of the apparatus with the periphery ofthe perforation. f

7. A terminal for electrical apparatus comprising a fiat base by meansof which the terminal is mounted upon the electrical apparatus, anextension extending from the base, said extension being df reduced widthand having an opening therein, and a clamping member for clamping anelectric conductor of the apparatus to the periphery of the opening.

.8. A terminal for electrical apparatus comprising a fiat base by meansof which the terminal is mounted upon the electrical apparatus. aperforated extension for the base, a resistor, and a hollow rivetextending through the perforated extension to clamp the resistorthereto.

9. A heater having in combination a resistor, insulating strips, a pairof sheet metal plates, one plate having flanges; folded over the otherto form an enclosure for the resistor insulated from the enclosure bythe insulating strips, a terminal having al fiat base insulated from andclamped in the enclosure by the flanges, an extension for the base ofthe terminal, and means for connecting the resistor to the extension.

10. A heater having in combination a resistor, insulating strips, a pairof sheet metal plates. one plate having flanges folded over the other toform an enclosure for the resistor insulated therefrom by the insulatingstrips, a terminal having a flat base clamped in the enclosure by theflanges, a perforated extension extending from the base, and clampingmeans cooperating with the perforated extension to clamp the resistorthereto.

11. Aheater having in combination a resistor, insulating strips, twoterminals, each having a flat base and an extension therefor, a` sheetmetal plate having flanges folded over but insulated from the base ofeach terminal to form an enclosure for the resistor insulated therefromby the insulating strips, and means for connecting the resistor to theextension.

12. A heater having in combination a resister, and an armor insulatedfrom and enclosing the resistor, said armor having parts thereofinsulated, from the remainder thereof to electrically isolate said partstherefrom, and saidresistor being connected with 10 said insulated partsof the armor.

In Witness whereof, I have hereunto subscribed my name.

EDWIN N. LIGHTFOOT.

